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7623586 |
Frequency and phase control apparatus and maximum likelihood decoder
A frequency and phase control apparatus includes an analog/digital conversion section for converting a reproduction signal into a multiple bit digital signal based on a clock signal; a maximum...
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7606321 |
System and method for simplifying analog processing in a transmitter incorporating a randomization circuit
The system and method enable simpler analog processing in a transmitter by reducing the number of bits in a digital signal through delta sigma modulation. Selection of current sources in a digital...
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7580732 |
Subscriber aggregated power
A system for supplying power in a communication network includes a network element and a plurality of subscriber devices in communication with the network element. Each of the plurality of...
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7532678 |
Method for transmitting data by multi-carrier modulation
During data transmission by multi-carrier modulation of data blocks modulated by Inverse Discrete Fourier Transformation (IDFT), carriers that are not occupied by data are occupied in such a way as...
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7508890 |
Apparatus and method for FSK demodulation with integrated time and frequency tracking
An FSK receiver comprising: 1) demodulation circuitry for receiving an incoming FSK signal and generating a baseband signal comprising an amplitude modulated symbol stream, of Logic 0 symbols and...
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7459939 |
Active pull up apparatus for a data bus
An active pull up configuration for data bus lines unaffected by integral pull up resistors within subsystems. The present application generally relates to digital systems comprising a plurality of...
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7342973 |
Method and apparatus for adapting multi-band ultra-wideband signaling to interference sources
A method and apparatus for operation in a multi-frequency band system in the presence of an interference, the method comprising the steps of: receiving signaling in a plurality of wideband...
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7263080 |
Architecture of an integrated circuit for streaming media over wireless networks
An integrated circuit for streaming media over wireless networks is disclosed. The integrated circuit includes a media module that is designed to process media data. When non-media data is in,...
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7184493 |
Pulse sorting apparatus for frequency histogramming in a radar receiver system
Disclosed is a real-time pulse sorting apparatus of a preprocessor in a pulsed radiation detection system. The apparatus, responsive to digital signals generated by a system receiver, uses the...
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7158588 |
System and method for obtaining accurate symbol rate and carrier phase, frequency, and timing acquisition for minimum shift keyed waveform
The present invention relates generally to communication systems, both wired and wireless, employing a continuous phase modulation (“CPM”) waveform with a minimum shift keying (“MSK”)...
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7068169 |
Use of a subcarrier in an organic semiconductor radio frequency identification system
A radio frequency identification system comprising a radio reader circuit operable to emit a radio frequency carrier signal modulated with a subcarrier, which has a subcarrier modulation rate. The...
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7039120 |
Device and method for the dynamic allocation of frequencies for multicarrier modulation systems
The method of transmitting data in the form of symbols sent over an electromagnetic channel is characterized in that a measurement of significance is attributed to each group of data to be...
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7003047 |
Tri-state integer cycle modulation
The invention disclosed in this application uses a method of modulation named Tri-State Integer Cycle Modulation (TICM) wherein a carrier signal, comprised of a continuum of sine waves is modulated...
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6952461 |
Sampling frequency conversion apparatus
A sampling frequency conversion apparatus which easily controls the phase difference (time difference) between the input data and the output data in converting the sampling frequency, includes a...
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6731745 |
Frequency deviation detecting apparatus and frequency deviation detecting method
A frequency deviation detecting apparatus for detecting frequency deviation of a dual tone multiple frequency (DTMF) signal includes frequency deviation analyzers for analyzing a received signal...
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6665350 |
Method and system for improved analog signal detection
A method and system for improved detection of analog signals, where the analog signals may be composed of one or more analog frequencies. In the method and system, an analog signal is received. A...
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6618449 |
Receiver for a frequency-shift-keying, continuous-wave radar
A receiver of a frequency-shift-keying, continuous-wave radar comprises at least sampling means taking real samples of the signals in each reception channel and extrapolation means, the...
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6614852 |
System for the estimation of the complex gain of a transmission channel
A system for the estimation of the complex gain of a transmission channel is designed for parallel type modulators/demodulators that can be used in digital radio broadcasting. The system includes a...
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6480551 |
Signal processing device and method for switching signal processors thereof
A digital broadcast program broadcast with a first network is transmitted to a second network. A tuner 41 selects digital broadcast signal having a predetermined transmission frequency and ECC...
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6456650 |
Splitterless modem using harmonics reduction
In a splitterless Digital Subscriber Line (DSL) modem 30 , a receiver architecture ( 100 ) that permits monitoring of harmonics within the upstream channel of a DSL connection. The receiver ( 100...
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6392499 |
Frequency shift modulation circuit
A frequency shift modulation circuit has a direct digital synthesizer DDS and a phase-locked loop PLL. DDS stores output signal frequency data in a plurality of registers. DDS selects the register...
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6282246 |
Frequency modulation method and modem unit employing such method
A frequency modulation method and modem unit for a frequency modulation using a common filter which uses a large number of carrier frequencies include a frequency-shifting unit for subjecting an...
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6025758 |
Method and apparatus for performing digital data signal modulation
The present invention includes a method for generating a GMSK modulating signal from a serial digital data bit stream whereby the GMSK modulating signal modulates a carrier frequency signal...
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6002725 |
M-ary FSK receiver
An M-ary FSK receiver in which a frequency down-converted signal is treated as an M-ary DPSK signal with symbol repetition coding. The output of a frequency demodulator (20) is integrated (22) over...
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5793795 |
Method for correcting errors from a jamming signal in a frequency hopped spread spectrum communication system
A selective call communication system (10) has a selective call device (100) for transmitting a frequency hopped spread spectrum signal (320) encoded as Reed Solomon code words and modulated as a...
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5705955 |
Frequency locked-loop using a microcontroller as a comparator
A frequency-locked loop (100) employs a controllable oscillator (102) for generating an output signal having a frequency, optional sampler (104), coupled to oscillator (102), for sampling the...
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5684831 |
Data bus with noise immunity
A class 2 or UART data communication bus is subject to disruption by induce high frequency currents because of an impedance mismatch between a passive pull-up or pull-down resistor and a lower...
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5668802 |
High-speed digital subscriber lines
A communications system employs a high-speed digital link with discrete multiple tone (DMT) the outward paths from a central transmitter/receiver to further transmitter/receivers receiving signals...
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5663986 |
Apparatus and method of transmitting data over a coaxial cable in a noisy environment
An apparatus and method of transmitting digital data over a coaxial cable a noisy environment using several carriers with narrower bandwidths in place of the single carrier with a wide bandwidth....
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5633893 |
Digital modulation method with controlled envelope variation
Continuous phase modulated (CPM) signals, such as quaternary CPFSK signals, are filtered to limit their bandwidth while simultaneously minimizing the amount of amplitude modulation and intersymbol...
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5557637 |
Convolutional ambiguity multiple access (CAMA) transmission system
A communication system that reduces significantly the processing required to search over unknown time delays and unknown frequency shifts. Convolutional type processing with a unique re-indexing of...
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5398031 |
DTMF signal generating circuit
A DTMF signal generating circuit for producing output of a selection signal having a frequency corresponding to a signal entered from push buttons. A high frequency oscillation signal output from...
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5351273 |
Process and system for the transmission of a signal
A system for the transmission of a signal having at least two conditions includes a device for emitting signals that has two oscillators whose signal amplitudes are alternately switched according...
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5329258 |
Multilevel FSK modulator having phase locked loop with controlled transient response
A multilevel frequency-shift keying (FSK) modulator is disclosed in which the transient response for frequency transition can be easily set. The modulator is of a type in which a frequency...
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5323125 |
Frequency agile method for transmitting multi-level data
A data transmitter (100) operating at a transmit frequency provides a modulated data signal (114) by adjusting a reference frequency signal (108). The method of modulating an N-level data signal...
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5245631 |
Process and device for transmitting numerical data
A process and a device transmits numerical data in the form of a sequence of words. The process includes an encoding phase, a transmission stage and a decoding phase. In the encoding phase, the...
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5005018 |
(U) modulator to provide a continuous stepped frequency signal format
A modulator provides a continuous signal format composed of discrete freqcy steps and is designed to eliminate frequency overlap or smearing normally associated with filter ringing.
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4972435 |
Frequency independent information transmission system
The system is used for transmitting information wherein each possible message unit in a set, (e.g. the alpha-numeric symbol set) is defined by a specific interval (I=f s /f R ) and messages are...
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4905256 |
Method and device for multistate modulation and demodulation with adjustable protection level
A method and device are provided for multistate modulation and demodulation with adjustable protection level, consisting in separating the binary signals, before demodulation, into critical and non...
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4802190 |
Method of transmitting information by means of code signals, information transmission system for carrying out the method, and transmitting and receiving apparatus for use in the transmission system
Method of transmitting information by means of code signals, information transmission systems for carrying out the method, and transmitting and receiving apparatus for use in the information...
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4723310 |
Digital data transmission system by coherent light wave modulation
A digital data transmission system by modulating a coherent light wave is provided using modulation of the MSFK type with N frequencies for modulating the light wave. The transmitter comprises a...
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4715045 |
System protocol for composite shift keying communication system
A system protocol for the composite shift key communication of binary signals in which a transmitting transceiver transmits a first summed signal having a first qualifying signal at a qualifying...
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4660215 |
Transmitter/receiver system
A transmitter/receiver system for converting digital information into a multi-frequency signal for transmission. A reference frequency signal is first transmitted, then a series of frequencies...
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4622681 |
Apparatus for transmitting digital data
An apparatus is disclosed for transmitting digital data by radio frequency electromagnetic radiation, wherein the radio frequency transmitter of the digital data is electrically isolated from the...
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4601045 |
Modulator-demodulator method and apparatus with efficient bandwidth utilization
A method and apparatus for modulating and demodulating information for bandlimited communication is disclosed. Serialized digital data is divided into equal segments which are arranged in parallel....
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4461012 |
Transmitter and receiver for transmitting digital signals
The transmitter comprises a multiplication circuit which receives on the one hand the digital signals and on the other hand, from a frequency generator, a signal with the timing of the digital...
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4454509 |
Apparatus for addressably controlling remote units
A load management system which includes a central message generator and a plurality of addressable remote load controllers which selectively connect and disconnect high power deferrable loads to...
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4435824 |
Communication system having improved differential phase shift keying modulation
A communication system which generates an output signal of a selected primary frequency having digital data bits serially modulated thereon by utilizing a hybrid differential phase shift keyed...
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4425666 |
Data encoding and decoding communication system for three frequency FSK modulation and method therefor
A system for three frequency FSK modulation wherein binary data bits are sequentially encoded into a ternary system of channels designated "1", "0" and "C", so that a data bit is encoded and...
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4425642 |
Simultaneous transmission of two information signals within a band-limited communications channel
A co-channel communications system is disclosed which permits a digital data signal to be simultaneously transmitted with a communications medium signal such as telephone voice or television video....
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